Thread cutting device for automatic looms



July 9, 1935.

K. TOYODA THREAD CUTTING DEVICE FOR AUTOMATIC LOOMS Filed Feb. 10, 1953INVENTOR.

ATTORNEYI.

' r Patented July 9, 1935 I UNITED STATES PATENT OFFICE THREAD CUTTINGDEVICE FOR AUTOMATIC LOOMS Kiichiro Toyoda, Nagoya, Japan ApplicationFebruary 10, 1933, Serial No. 656,071

1 Claim. (01. 139-303) This invention relates to a. device for cuttingfront side of the slay 2 is fitted with a presser the trailing threadsnear the selvage of the fabric contact I which is adapted to engage withand upon the weft replenishing operation in an autO- press against thelower end of the depending matic loom. shank 9 of the hammer when theslay 2 reaches 5 In the hitherto known device employing a conthe end ofthe forward movement. 5 tinuously moving cutter, there is a disadvantageWhen a weft replenishing operation, for inthat the cutting edge of thecutter is subjected to stance, a shuttle exchange operation takes place,continuous wear so that it must be renewed fretrailing threads of thespent and fresh shuttles quently, since otherwise the cutter would failto pass through the space between the hammer 6 and 10 effectively severthe threads and the threads the anvil l in the slot 5. As soon as theslay 2 10 tend to wrap around the cutter. In order to reaches the end ofthe forward movement, the prevent the cutter from being subjected toconpresser contact H3 impinges upon the lower end tinuous wear, it hasbeen proposed to provide a of the depending shank 9 of the hammer, sothat mechanism wherein the cutter acts only twice in I the hammer proper6 will suddenly turn downsuccession after the completion of the weftrewardly and, cooperating with the anvil 1, cut 15 plenishing operation,so that it cuts the freshly the trailing thread by blow. On experiments,I inserted thread as well as the nearly spent thread. have found thatthe hammer succeeds in cutting Irrespective of continuous orintermittent operathe thread by a single blow. Assuming that the tion ofthe cutter, in the prior mechanisms, the hammer should fail tocompletely sever the cutter consisting of a blade or shears would afterthread at the first blow, there would not be en- 20 all becomeineffective by reason of the wearing countered any difficulty, since thehammer 6 acts d wn f e c n e er f, an wr pping continuously during theoperation of the loom. Of the trailing thread Would Often take D a Onthe other hand, regardless of the continuous ing in completely cuttingthe threads. movement, the cutting mechanism according to The Object ofthe P s invention i this invention remains effective for a long time, 25move such disadvanta n xi n vi by practically for the entire life of theloom, since p v d a novel Construction Of Cutting mechthe cutter hasneither blade nor cutting edge anism which can be used effectively for along which requires t be renewed time without necessitating renewal ofthe cutter. I have herein described t principle and Another Object ofthe inventmn is to Provide eration of my invention, together with thedevice 30 Cutting mechamsm mf is of Yerysimple P which I now consider torepresent the best emstruction, l e j e adJU-stmg b odiment thereof, butI desire to have it underthe drawmg' lnusuatmg W now stood that thedevice shown is only illustrative and slder the preferred f0rm'9f n thatthe invention can be carried out by other Figure 1 is a sectional sideview of certain parts an automatm 100m with my mechamsm be employed foractuating the hammer forming plied'thereto, and o the cutter Figure 2 isa detail'plan view in an enlarged What I claim is:

scale r In a loom, the combination with a temple case Referrmg to thedrawmg 1s a slay Sword 2 and a slay, of a thread severing device,compris- 40 the slay 3 reed capiand 4 1S temple cast? on ing a pivotallymounted hammer having a dethe loom frame. In said temple case 4 1sprov1ded pending shank for normally h 01 ding the h mm m er T 5 thesgvage of the fabric head in elevated position, means provided on saidcording to this invention, the cutter cons1sts of a Slay for OperatingSaid hammer through said hammer 6 and an anvil 1 formed by the bottompending shank, and an anvil-formed bottom of a of said slot 5 in thetemple case 4. The hammer I B is pivoted at 8, and has a depending Shank9, $113111; eslald temple case for cooperating with said the arrangementbeing such that the hammer proper 6 is normally held in the elevatedposition by the weight of the depending shank 9. The

KIICHIRO TOYODA.

means. For instance, any other mechanism may I

